Side by side

Serica Ref. 5303 Diving ChronometervsSeiko Prospex LX line

The numbers, the dial colors, the calibers — laid out so you can stop flipping between tabs.

Ref. 5303 Diving Chronometer
SericaRef. 5303 Diving Chronometer
MSRP $1,768
Prospex LX line
SeikoProspex LX line
MSRP $6,500

At a glance

14 of 29 specs differ
Diameter
Ref. 5303 Diving Chronometer39mm
Prospex LX line44.8mm
Power Reserve
Ref. 5303 Diving Chronometer42h
Prospex LX line72h
Water Resistance
Ref. 5303 Diving Chronometer300m
Prospex LX line300m
MSRP
Ref. 5303 Diving Chronometer$1,768
Prospex LX line$6,500

Full specifications

Case

5 specs
Diameter
39mm
44.8mm
Thickness
12.2mm
15.7mm
Lug-to-Lug
46.5mm
50.9mm
Lug Width
20mm
22mm
Material
Stainless Steel
Titanium

Crystal & Dial

3 specs
AR Coating
Yes
Anti-reflective coating on inner surface
Dial Color
Enamel Black
Black
Lume
Super-LumiNova
LumiBrite on hands and index(es)

Movement

5 specs
Caliber
M100 COSC
5R65
Type
Automatic
Spring Drive
Power Reserve
42h
72h
Jewels
25
30
Complications
COSC
None

Pricing

1 specs
MSRP
$1,768
$6,500

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What people say

Owners + reviewers, side by side

Synthesized for each watch independently from owner discussions, enthusiast forums, written reviews, and video reviewers.

Serica Ref. 5303 Diving Chronometer

Owners widely praise the Serica Ref. 5303 Diving Chronometer for its excellent wearability, definitive style, and smooth, confident bezel action. The dual scale on the bezel is noted as surprisingly useful, and the crown action, winding, and hacking are reported to work perfectly. One owner describes the Serica 5303-3 as gorgeous and unique, though another notes the crown can appear comically large. On balance, owners rate the Serica Ref. 5303 Diving Chronometer highly for its blend of unique design and robust functionality.

Seiko Prospex LX line

Owners widely report the Seiko Prospex LX line's finishing is a step up from other models, with a case that sits well on the wrist, and some praise the green sunburst dial with blue anti-reflective sapphire crystal as phenomenal. However, owners note the high MSRP limited sales, with some desiring smaller cases and a reduced price, and others experienced quality control issues such as detached second hands and peeling DLC coating, leading to concerns about fragility. On balance, owners feel the Seiko Prospex LX line was discontinued due to pricing that alienated its target market, despite its attractive dial.

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